My much loved mirror door drive powerpc G4 died last night (power supply kaput) and I pulled the three IDE drives it contained this morning and put them in new external IDE to USB enclosures. With two of them (Western Digital caviar 160GB and Western Digital caviar 250GB) I get the "The disk you inserted is not readable by this computer" message on my intel MBP booted in OS10.6 or 10.8, my intel Mac mini running 10.6 and an old G4 mini running 10.4. They show up in Disk Utility but the verify and repair options are greyed out.The third drive is an IBM Deskstar 80GB that shipped with the G4 and was the boot drive (OS 10.5). It spins up but does not evoke a "not readable" message or show up at all in Disk Utility.All three drives were working fine last night before the MDD G4 died.Any help getting these drives working as external drives would be much appreciated.

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